add create_track_objects

ges/ges-timeline-object.c

@@ -35,6 +35,9 @@ gboolean
 ges_timeline_object_fill_track_object_func (GESTimelineObject * object,
     GESTrackObject * trackobj, GstElement * gnlobj);
 
+gboolean
+ges_timeline_object_create_track_objects_func (GESTimelineObject
+    * object, GESTrack * track);
 
 G_DEFINE_TYPE (GESTimelineObject, ges_timeline_object, G_TYPE_OBJECT);
 
@@ -116,6 +119,7 @@ ges_timeline_object_class_init (GESTimelineObjectClass * klass)
   object_class->set_property = ges_timeline_object_set_property;
   object_class->dispose = ges_timeline_object_dispose;
   object_class->finalize = ges_timeline_object_finalize;
+  klass->create_track_objects = ges_timeline_object_create_track_objects_func;
 
   /**
    * GESTimelineObject:start
@@ -214,6 +218,50 @@ ges_timeline_object_create_track_object (GESTimelineObject * object,
   return res;
 }
 
+/**
+ * ges_timeline_object_create_track_objects:
+ * @object: The origin #GESTimelineObject
+ * @track: The #GESTrack to create each #GESTrackObject for.
+ *
+ * Creates all #GESTrackObjects supported by this object and adds them to the
+ * provided track. The the track is responsible for calling
+ * #ges_timeline_release_track_object on these objects when it is finished
+ * with them.
+ *
+ * Returns: True if each track object was created successfully, or false if an
+ * error occured.
+ */
+
+gboolean
+ges_timeline_object_create_track_objects (GESTimelineObject * object,
+    GESTrack * track)
+{
+  GESTimelineObjectClass *klass;
+
+  klass = GES_TIMELINE_OBJECT_GET_CLASS (object);
+
+  if (!(klass->create_track_objects)) {
+    GST_INFO ("no create_track_objects implentation");
+    return FALSE;
+  }
+
+  return klass->create_track_objects (object, track);
+}
+
+gboolean
+ges_timeline_object_create_track_objects_func (GESTimelineObject * object,
+    GESTrack * track)
+{
+  GESTrackObject *result;
+
+  result = ges_timeline_object_create_track_object (object, track);
+  if (!result) {
+    GST_WARNING ("couldn't create track object");
+    return FALSE;
+  }
+  return ges_track_add_object (track, result);
+}
+
 /**
  * ges_timeline_object_release_track_object:
  * @object: a #GESTimelineObject

ges/ges-timeline-object.h

@@ -69,9 +69,8 @@ typedef gboolean (*FillTrackObjectFunc) (GESTimelineObject * object,
  *
  * Creates the 'primary track object for this @object.
  * 
- * Implementors should override this function if they only need to create one
- * track object per track. If the implementor wishes to create multiple track
- * objects, they should override create_track_objects instead.
+ * Implementors should override this function if they only interested in
+ * creating a single custom track object per track.
  *
  * The implementer of this function shall return the proper #GESTrackObject
  * that should be controlled by @object for the given @track.
@@ -84,6 +83,18 @@ typedef gboolean (*FillTrackObjectFunc) (GESTimelineObject * object,
 typedef GESTrackObject* (*CreateTrackObjectFunc) (GESTimelineObject * object,
 						  GESTrack * track);
 
+/**
+ * CreateTrackObjectFunc:
+ * @object: a #GESTimelineObject
+ * @track: a #GESTimelineTrack
+ * 
+ * Create all track objects this object handles for this type of track.
+ *
+ * Returns: %TRUE on success %FALSE on failure.
+ */
+typedef gboolean (*CreateTrackObjectsFunc) (GESTimelineObject * object,
+                                            GESTrack *track);
+
 /**
  * GES_TIMELINE_OBJECT_START:
  * @obj: a #GESTimelineObject

ges/ges-timeline.c

@@ -265,7 +265,9 @@ add_object_to_tracks (GESTimeline * timeline, GESTimelineObject * object)
     GESTrack *track = priv->track;
 
     GST_LOG ("Trying with track %p", track);
-    ges_timeline_object_create_track_objects (object, track);
+    if (!ges_timeline_object_create_track_objects (object, track)) {
+      GST_WARNING ("error creating track objects");
+    }
   }
 }